Chemicals and Drugs

3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide)

A ketone oxidoreductase that catalyzes the overall conversion of alpha-keto acids to ACYL-CoA and CO2. The enzyme requires THIAMINE DIPHOSPHATE as a cofactor. Defects in genes that code for subunits of the enzyme are a cause of MAPLE SYRUP URINE DISEASE. The enzyme was formerly classified as EC 1.2.4.3.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A ketone oxidoreductase that catalyzes the overall conversion of alpha-keto acids to ACYL-CoA and CO2. The enzyme requires THIAMINE DIPHOSPHATE as a cofactor. Defects in genes that code for subunits of the enzyme are a cause of MAPLE SYRUP URINE DISEASE. The enzyme was formerly classified as EC 1.2.4.3.

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Classification

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MeSH Record

Synonyms

21 entry terms
  • 2-Oxoisocaproate Dehydrogenase
  • 2-Oxoisovalerate Dehydrogenase (Lipoamide)
  • Alpha-Keto Acid Dehydrogenase
  • BCKA Decarboxylase
  • Branched Chain Alpha-Keto Acid Decarboxylase
  • Branched Chain Ketoacid Dehydrogenase
  • Branched-Chain 2-Oxo Acid Dehydrogenase
  • Branched-Chain Keto Acid Dehydrogenase
  • Branched-Chain Oxo-Acid Dehydrogenase
  • 2 Oxoisocaproate Dehydrogenase
  • Acid Dehydrogenase, Alpha-Keto
  • Alpha Keto Acid Dehydrogenase
  • Branched Chain 2 Oxo Acid Dehydrogenase
  • Branched Chain Alpha Keto Acid Decarboxylase
  • Branched Chain Keto Acid Dehydrogenase
  • Branched Chain Oxo Acid Dehydrogenase
  • Decarboxylase, BCKA
  • Dehydrogenase, 2-Oxoisocaproate
  • Dehydrogenase, Alpha-Keto Acid
  • Dehydrogenase, Branched-Chain Oxo-Acid
  • Oxo-Acid Dehydrogenase, Branched-Chain

MeSH Record

Aspects Covered

29 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, analysis, antagonists & inhibitors, biosynthesis, blood, cerebrospinal fluid, chemical synthesis, chemistry, classification, deficiency, drug effects, economics, genetics, history, immunology, isolation & purification, metabolism, pharmacokinetics, pharmacology, physiology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity, ultrastructure, urine.

MeSH Record

History Note

2004; use 3-METHYL-2-OXBUTANOATE DEHYDROGENASE (LIPOAMIDE) (NM) 1973-2003

MeSH Record

Previous Indexing

  • Amino Acids, Branched Chain (1979-1981)
  • Carboxy-Lyases (1974-1979)
  • Keto Acids (1973-1981)
  • Ketone Oxidoreductases (1982-2003)
  • Multienzyme Complexes (1982-2003)

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References

  1. National Library of Medicine. 3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide). Medical Subject Headings (MeSH). 2026. Unique ID D042942. http://id.nlm.nih.gov/mesh/2026/D042942
  2. 3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide). In: Wikipedia. https://en.wikipedia.org/wiki/Branched-chain_alpha-keto_acid_dehydrogenase_complex
  3. 3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide). In: Wikidata. https://www.wikidata.org/wiki/Q22327132